Priming mixture



Patented Nov. 2, 1937 UNlTED STATES PATENT OFFICE PRIMING MIXTURE Willi Briin, Stratford, Conn, assignor to Remington Arms Company, Inc., a corporation of Delaware No Drawing. Application August 3, 1935, Serial No. 34,637

4 Claims.

5 has been found that by the use of this silver salt it is feasible to prepare and load nonmercuric non-corrosive mixtures into centerfire cartridges in a dry condition, a result which has not hitherto been attained. Silver styphnate may be prepared by the addition of a solution of a soluble silver salt or a strong acid, such as nitric acid, to a solution of a soluble styphnate, such as magnesium styphnate. Excellent yields of the silver salt in a condition suitable for use as an ingredient of priming mixtures are secured.

Typical compositions are as follows:

Per cent Per cent Mercury iulminate to 35 preferably Silver styphnate 5 to 30-----do 20 0 Antimony sulphide..- 5 to 20-----do 9 Calcium silicide 5 to 15..----do '7 Per cent Per cent Lead peroxide 3to10 preferably '7 Barium nitrate 10 to 50' do 37 Guanylnitrosaminoguanyltetrazene 1to 4 do 2 5 Silver styphnate 30 to 45 do 38 Barium nitrate to 60 do 39 Lead peroxide 3to15 do 5 Antimony sulphide 2 to 20 do 5 Calcium silicide 2 to 20 do- 11 10 What is claimed is:

1. An ammunition priming composition containing a silver salt of styphnic acid.

2. An ammunition priming composition con- 15 taining di-silver styphnate.

3. An ammunition priming composition containing a sensitizing ingredient, oxidizing and fuel ingredients, and a silver styphnate.

4. An ammunition priming composition sub- 20,

stantially as follows:

Guanylnitrosamino- Per cent Per cent guanyltetrazene lto 4 preferably 2 Silver styphnate to -----do 38 Barium nitrate 25 to do 39 25 Lead peroxide 3to15 do 5 Antimony sulphide 2to 20-..---do 5 Calcium silicide 2to20 do 11 W'ILLI BRiiN. 30 

